JP2017048855A - Driving device and image formation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device capable of selectively switching drive transmission paths of two systems while suppressing a rise in cost, and an image formation apparatus.SOLUTION: A driving device 30 comprises: a driving source 1 capable of rotating and reversing; a rotatable input-side rotary member 1a inputting rotary driving force from the driving source; a rotatable output-side rotary member 8 outputting rotary driving force to a body 181a to be driven; and drive transmission path switching means of alternating drive transmission paths of two systems for transmitting the rotary driving force from the input-side rotary member to the output-side rotary member with a drive transmission path from the input-side rotary member to the output-side rotary member, and the drive transmission path switching means has a rotatable moving rotary member 2 which moves in different thrust directions between the drive transmission paths of the two systems when the driving source rotates and reverses so as to transmit the rotary driving force from the driving source to one drive transmission path between the drive transmission paths of the two systems or the other drive transmission path.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drive device and an image forming apparatus.

  2. Description of the Related Art Image forming apparatuses such as copying machines, printers, facsimiles, or their combined machines are provided with many drive devices for image forming operations.

  Japanese Patent Application Laid-Open No. 2004-228561 describes such a drive device that rotates a paper discharge roller, which is a driven body, forward and backward. This drive device includes an input shaft to which a rotational drive force is input from a drive motor that is a drive source capable of normal rotation and reverse rotation, and an output shaft that outputs the rotational drive force to a paper discharge roller. There are two drive transmission paths from the input shaft to the output shaft, and meshes with the gear for transmitting the rotational driving force of the drive motor to the two drive transmission paths to selectively switch the two drive transmission paths. A one-way clutch is provided. During forward rotation of the drive motor, the one-way clutch is locked, and the rotational drive force from the drive motor is transmitted to one of the two drive transmission paths via the gear. On the other hand, at the time of reverse rotation of the drive motor, the one-way clutch rotates idly, and the rotational drive force from the drive motor is transmitted to the other drive transmission path of the two systems through the gear.

  However, in the drive device described in Patent Document 1, a one-way clutch is provided to selectively switch between the two systems of drive transmission paths, resulting in a problem that the cost increases accordingly.

  In order to solve the above-described problems, the present invention provides a drive source capable of normal rotation and reverse rotation, a rotatable input-side rotating member to which a rotational driving force is input from the drive source, and rotationally driven to a driven body. A rotatable output-side rotating member that outputs force, a two-system drive transmission path for transmitting rotational driving force from the input-side rotating member to the output-side rotating member, and the input-side rotating member to the output side In the drive device including the drive transmission path switching means for switching the drive transmission path to the rotating member, the drive transmission path switching means is configured to drive the two systems of the drive transmission paths when the drive source is rotating forward and when the drive is rotating backward. A rotatable movement that transmits a rotational driving force from the drive source to one of the two systems of drive transmission paths or the other of the two drive transmission paths. Rotating member Characterized in that it.

  As described above, according to the present invention, there is an excellent effect that the two drive transmission paths can be selectively switched while suppressing an increase in cost.

4 is a schematic cross-sectional view of a drive device that drives a paper discharge roller according to Configuration Example 1. FIG. 1 is a schematic configuration diagram of a printer according to an embodiment. The schematic sectional drawing of the drive device at the time of the motor reverse rotation which rotated the motor in the reverse direction to FIG. The schematic sectional drawing of a drive device at the time of providing a worm gear in the output shaft of a motor. FIG. 6 is a schematic cross-sectional view of a drive device according to Configuration Example 2. FIG. 6 is a schematic cross-sectional view of the drive device during motor reverse rotation in which the motor is rotated in a direction opposite to that in FIG. 5. FIG. 10 is a schematic cross-sectional view of a drive device according to Configuration Example 3. FIG. 10 is a schematic cross-sectional view of a drive device according to Configuration Example 4. FIG. 10 is a diagram showing a drive transmission configuration of a drive device according to Configuration Example 5; FIG. 10 is a diagram showing a drive transmission configuration of a drive device according to Configuration Example 6; FIG. 10 is a diagram illustrating a drive transmission configuration of a drive device according to Configuration Example 7;

[Embodiment 1]
Hereinafter, as an image forming apparatus to which the present invention is applied, an embodiment of an electrophotographic printer (hereinafter simply referred to as a printer) will be described. First, the basic configuration of the printer will be described. FIG. 2 is a schematic configuration diagram of the printer according to the embodiment. In this figure, the printer includes four process units 160Y, 160C, 160M, and 160K for forming toner images of yellow, cyan, magenta, and black (hereinafter referred to as Y, C, M, and K). Yes. These use Y, C, M, and K toners of different colors as image forming materials, but the other configurations are the same and are replaced when the lifetime is reached. For example, a process unit 160K for forming a K toner image includes a drum-shaped photoconductor 161K as a latent image carrier, a developing device 162K, a charging device 163K, a drum cleaning device 164K, a static eliminator, and the like. The process unit 160K as an image forming unit can be attached to and detached from the printer main body, and consumable parts can be exchanged at a time.

  The charging device 163K uniformly charges the surface of the photosensitive member 161K that is rotated clockwise in the drawing by the driving unit. The uniformly charged surface of the photoconductor 161K is exposed and scanned by the laser beam L to carry an electrostatic latent image for K. The electrostatic latent image for K is developed into a Y toner image by a developing device 162K using K toner. Then, intermediate transfer is performed on an intermediate transfer belt 179 described later. The drum cleaning device 164K removes transfer residual toner adhering to the surface of the photoreceptor 161K after the intermediate transfer process. In addition, the static eliminator neutralizes residual charges on the photoreceptor 161K after cleaning. By this charge removal, the surface of the photoreceptor 161K is initialized and prepared for the next image formation. In the other color process units 160Y, 160C, and 160M, Y, C, and M toner images are similarly formed on the photoreceptors 161Y, 161C, and 161M, and are intermediately transferred onto an intermediate transfer belt 179 described later. Note that the cylindrical drum portion of the photoreceptor 161K is obtained by coating an organic photosensitive layer on the front surface of a hollow aluminum base tube. A flange having a drum shaft is attached to both end portions in the axial direction of the drum portion to constitute a photoreceptor 161K. In the developing device 162K, the K toner contained therein is formed on the surface of the photosensitive member 161K in the developing region which is a region where the developing roller 162aK and the photosensitive member 161K face each other as the developing roller 162aK rotates. It is attached to an electrostatic latent image and developed into a K toner image.

  The K process unit 160K has been described with reference to FIG. 2, but the Y, C, and M process units 160Y, 160C, and 160M also perform the same process on the surfaces of the photoreceptors 161Y, 161C, and 161M. C and M toner images are formed.

  In FIG. 2 shown above, an optical writing unit 165 is disposed above the process units 160Y, 160C, 160M, and 160K in the vertical direction. The optical writing unit 165 serving as a latent image writing device optically scans the photosensitive members 161Y, 161C, 161M, and 161K in the process units 160Y, 160C, 160M, and 160K with a laser beam L emitted from a laser diode based on image information. To do. By this optical scanning, electrostatic latent images for Y, C, M, and K are formed on the photoreceptors 161Y, 161C, 161M, and 161K. In such a configuration, Y, C, M, and K toners that are visible images of different colors on three or more latent image carriers by the optical writing unit 165 and the process units 160Y, 160C, 160M, and 160K. It functions as an image forming means for forming an image.

  The optical writing unit 165 irradiates the photosensitive member through a plurality of optical lenses and mirrors while polarizing the laser light emitted from the light source in the main scanning direction by a polygon mirror rotated by a polygon motor. is there. You may employ | adopt what performs optical writing by the LED light emitted from several LED of the LED array.

  Below the process units 160Y, 160C, 160M, and 160K, a transfer unit 175, which is a belt device that stretches an endless intermediate transfer belt 179 and moves it endlessly in the counterclockwise direction in the figure, is disposed. . The transfer unit 175 also includes a drive roller 176, a tension roller 177, primary transfer rollers 174Y, 174C, 174M, and 174K, a secondary transfer roller 178, a belt cleaning device 171, a cleaning backup roller 172, and the like. The intermediate transfer belt 179 is stretched by a driving roller 176, a tension roller 177, a cleaning backup roller 172, and four primary transfer rollers 174Y, 174C, 174M, and 174K disposed inside the loop. Then, it is moved endlessly in the same direction by the rotational force of the driving roller 176 that is driven to rotate counterclockwise in the drawing by the driving means.

  The four primary transfer rollers 174Y, 174C, 174M, and 174K sandwich the intermediate transfer belt 179 that is moved endlessly in this manner between the photoreceptors 161Y, 161C, 161M, and 161K. By this sandwiching, primary transfer nips for Y, C, M, and K where the front surface of the intermediate transfer belt 179 and the photoconductors 161Y, 161C, 161M, and 161K abut are formed. A primary transfer bias is applied to the primary transfer rollers 174Y, 174C, 174M, and 174K by a transfer bias power source. Thus, a transfer electric field is formed between the electrostatic latent images on the photoconductors 161Y, 161C, 161M, and 161K and the primary transfer rollers 174Y, 174C, 174M, and 174K. In place of the primary transfer rollers 174Y, 174C, 174M, and 174K, a transfer charger, a transfer brush, or the like may be employed.

  When the Y toner formed on the surface of the photoreceptor 161Y of the Y process unit 160Y enters the above-described primary transfer nip for Y as the photoreceptor 161Y rotates, the photoreceptor is affected by the transfer electric field and the nip pressure. 161Y is primarily transferred onto the intermediate transfer belt 179. The intermediate transfer belt 179 on which the Y toner image has been primarily transferred in this way passes over the primary transfer nips for M, C, and K along with the endless movement thereof, and thus is on the photoreceptors 161M, 161C, and 161K. The M, C, and K toner images are primarily transferred onto the Y toner image in a superimposed manner. A four-color toner image is formed on the intermediate transfer belt 179 by this superimposing primary transfer.

  The secondary transfer roller 178 of the transfer unit 175 is disposed outside the loop of the intermediate transfer belt 179, and the intermediate transfer belt 179 is sandwiched between the tension roller 177 inside the loop. By this sandwiching, a secondary transfer nip is formed in which the front surface of the intermediate transfer belt 179 and the secondary transfer roller 178 abut. A secondary transfer bias is applied to the secondary transfer roller 178 by a transfer bias power source. By this application, a secondary transfer electric field is formed between the secondary transfer roller 178 and the tension roller 177 connected to the ground.

  Below the transfer unit 175 in the vertical direction, a paper feed cassette 141 that stores a plurality of recording papers P in a bundle of sheets is slidably attached to the printer housing. In the paper feed cassette 141, a paper feed roller 142 is brought into contact with the top recording paper P of the paper bundle, and the recording paper is rotated by rotating it in a counterclockwise direction in the drawing at a predetermined timing. P is sent out toward the paper feed path.

  A registration roller pair 143 including registration rollers 143a and 143b is disposed near the end of the paper feed path. The registration roller pair 143 stops the rotation of both rollers as soon as the recording paper as the recording member fed from the paper feed cassette 141 is sandwiched between the rollers. Then, rotation driving is resumed at a timing at which the sandwiched recording paper can be synchronized with the four-color toner image on the intermediate transfer belt 179 in the above-described secondary transfer nip, and the recording paper P is sent out toward the secondary transfer nip. .

  The four-color toner image on the intermediate transfer belt 179 brought into close contact with the recording paper at the secondary transfer nip is subjected to batch secondary transfer onto the recording paper P under the influence of the secondary transfer electric field and nip pressure, and the recording paper P In combination with the white color, a full color toner image is obtained. Note that the untransferred toner that has not been transferred to the recording paper adheres to the intermediate transfer belt 179 after passing through the secondary transfer nip. This is cleaned from the belt surface by the belt cleaning device 171 in contact with the front surface of the intermediate transfer belt 179. A cleaning backup roller 172 disposed inside the loop of the intermediate transfer belt 179 backs up the belt cleaning by the belt cleaning device 171 from the inside of the loop.

  When the recording paper P having a full-color toner image formed on the surface thereof passes through the secondary transfer nip, the recording paper P is separated from the secondary transfer roller 178 and the intermediate transfer belt 179 by curvature. Then, the toner is fed into a fixing device 140 as a fixing unit via a post-transfer conveyance path. The fixing device 140 is provided with a fixing roller 145 including a heat source 145a such as a halogen lamp, and a pressure roller 147 that rotates while contacting the fixing roller 145 with a predetermined pressure. A fixing nip is formed by the pressure roller 147. The recording paper fed into the fixing device 140 is sandwiched between the fixing nips such that the unfixed toner image carrying surface is in close contact with the fixing roller 145. Then, the toner in the toner image is softened by the influence of heating and pressurization, and the full color image is fixed.

  When the single-sided print mode is set by an input operation to the operation unit or a control signal sent from a personal computer or the like, the recording paper P discharged from the fixing device 140 is a pair of paper discharge rollers that rotate forward. By 181, it is discharged to the outside as it is. Then, it is stacked on the stack unit 150 which is the upper surface of the upper cover of the housing.

  Further, the paper discharge roller pair 181 discharges the recording paper P conveyed from the fixing device 140 to the stack unit 150. On the other hand, when the duplex printing mode is set, the paper discharge roller pair 181 is reversed. The recording paper P is switched back to the refeed path 170 side. That is, the paper discharge roller pair 181 includes a pair of paper discharge rollers 181a and 181b. When the paper discharge sensor 182 detects a nip state in which the recording paper P is sandwiched between the paper discharge rollers 181a and 181b, the paper discharge rollers 181a and 181b are discharged. The paper rollers 181a and 181b are reversed. As a result, the recording paper P is conveyed by the double-sided roller 183, passes through the refeed path 170, and is conveyed again to the secondary transfer nip in a state where the front and back sides are reversed in a direction that allows transfer onto the back surface. Then, after passing through the secondary transfer nip and a toner image is formed on the back surface of the recording paper P, the toner image is fixed on the recording paper P by the fixing device 140 and discharged to the stack unit 150 by the discharge roller pair 181. The In the present embodiment, the paper discharge roller 181a of the paper discharge roller pair 181 is rotated by a drive device 30 described later, but at least one paper discharge roller of the paper discharge roller pair 181 is rotated by the drive device 30. What is necessary is just to comprise.

[Configuration example 1]
FIG. 1 is a schematic cross-sectional view of a driving device 30 that drives a paper discharge roller 181a according to Configuration Example 1. As shown in FIG. 1, the drive device 30 includes a motor 1 that is a drive source capable of forward and reverse rotation, and the motor 1 is attached to the side plate 131. A helical gear 1a is provided on the output shaft of the motor 1, and the helical gear 1a meshes with an idler gear 2 that is a helical gear. The idler gear 2 is rotatably supported by a fixed shaft S1 fixed to the side plate 131 and the side plate 132, and a plurality of drive connection claws 2a and drive connection claws 2b are provided on both side surfaces in the axial direction. A plurality of drive connection holes 9a into which the plurality of drive connection claws 2a are fitted are formed on the rotation path of the drive connection claw 2a on the side surface of the external gear 9 that is rotatably supported by the fixed shaft S1. Is formed. Then, the idler gear 2 moves to the axial external gear 9 side while rotating on the fixed shaft S1, and the idler gear 2 and the external gear 9 are engaged by the drive coupling claw 2a fitting into the drive coupling hole 9a. It is possible. A plurality of drive connection holes 3a into which the plurality of drive connection claws 2b are fitted are formed on the rotation track of the drive connection claws 2b on the side surface of the pulley 3 that is rotatably supported by the fixed shaft S1. Is formed. And the idler gear 2 moves to the axial pulley 3 side while rotating on the fixed shaft S1, and the idler gear 2 and the pulley 3 can be engaged by the drive coupling claw 2b fitting into the drive coupling hole 9a. Yes.

  The fixed shaft S2 is fixed to the side plate 131 and the side plate 132 at a position shifted in the radial direction with respect to the fixed shaft S1 toward the paper discharge roller 181a, and the rotation shaft 7 of the paper discharge roller 181a is provided on the side plate 132. The bearing 132a is rotatably supported. A pulley 5 that stretches the timing belt 4 together with the pulley 3 is rotatably supported on the fixed shaft S2. The external gear 10 that meshes with the external gear 9 coaxially with the pulley 5 and the drive gear 6 that meshes with the external gear 8 fixed to the rotary shaft 7 of the paper discharge roller 181a by the fixing pin 7a are freely rotatable. It is supported by.

  1 includes a first drive transmission path R1 and a second drive transmission path R2, which are two systems of drive transmission paths for transmitting the driving force of the motor 1 to the paper discharge roller 181a. ing. The first drive transmission path R1 includes a pulley 3, which is a drive transmission member, a timing belt 4, and a pulley 5. The second drive transmission path R2 is an external gear 9 and an external gear which are drive transmission members. 10.

  The direction F of the thrust force acting on the idler gear 2 from the helical gear 1a is determined by the rotational direction of the motor 1 and the twisting direction of the helical gear 1a. In FIG. 1, the rotation direction of the motor 1 is the clockwise direction (CW), and the twisting direction of the helical gear 1a is on the left, so that the thrust force acts on the idler gear 2 from the helical gear 1a to the pulley 3 side. Therefore, the idler gear 2 moves to the pulley 3 side in the thrust direction, the drive connecting claw 2b is fitted into the drive connecting hole 3a, and the idler gear 2 and the pulley 3 are engaged, so that the idler gear 2 drives the pulley 3. The pulley 3 drives a pulley 5 that is rotatably attached to the fixed shaft S <b> 2 via the timing belt 4. The drive gear 6 arranged coaxially with the pulley 5 drives the external gear 8 provided on the rotation shaft 7 of the paper discharge roller 181a. As a result, the paper discharge roller 181a provided on the rotary shaft 7 rotates in the same direction as the rotation direction of the motor 1 by the driving force transmitted from the first drive transmission path R1.

  FIG. 3 is a schematic cross-sectional view of the drive device 30 at the time of reverse rotation of the motor 1 in which the motor 1 is rotated in the direction opposite to that in FIG. In the driving device 30 shown in FIG. 3, since the motor 1 is driven in the counterclockwise direction (CCW), a thrust force acts on the idler gear 2 from the helical gear 1a to the external gear 9 side. Therefore, the idler gear 2 moves to the external gear 9 side in the thrust direction, the drive connecting claw 2a is fitted into the drive connecting hole 9a, and the idler gear 2 and the external gear 9 are engaged, so that the idler gear 2 is externally connected. The gear 9 is driven. The external gear 9 drives an external gear 10 that is arranged coaxially with the pulley 5. The drive gear 6 arranged coaxially with the external gear 10 drives the external gear 8 provided on the rotating shaft 7 of the paper discharge roller 181a. Thereby, the discharge roller 181a provided on the rotary shaft 7 is decelerated by the pulley 3 / pulley 5 in the direction opposite to the rotation direction of the motor 1 by the driving force transmitted from the second drive transmission path R2. Driven at a different speed than the ratio.

  In the driving device 30 according to the present configuration example, the idler gear 2 is moved in different directions in the thrust direction between the two drive transmission paths during forward rotation and reverse rotation of the motor 1, thereby driving from the Hasuba gear 1a. The drive transmission path to the gear 6 can be switched. That is, the idler gear 2 having a function of transmitting the rotational driving force from the motor 1 to each drive transmission path is also used as a member for selectively switching the two systems of drive transmission paths. Therefore, in addition to the gear for transmitting the rotational driving force from the motor 1 to each drive transmission path, the one-way clutch is not provided as compared with the configuration in which the one-way clutch for selectively switching the two drive transmission paths is provided. The increase in cost can be suppressed.

  Here, in order to switch the drive transmission path, in the configuration in which the idler gear 2 is moved in the radial direction and meshed with the external gear 9, a loud noise can be generated when the idler gear 2 and the external gear 9 are engaged. On the other hand, in the configuration in which the idler gear 2 is moved in the thrust direction and the drive connection claw 2a provided on the side surface of the idler gear 2 and the drive connection hole 9a formed on the side surface of the external gear 9 are fitted, the gears are engaged with each other. Therefore, the generation of the loud sound can be suppressed. Therefore, by adopting a configuration in which the idler gear 2 is moved in the thrust direction and the two drive transmission paths are selectively switched as in the driving device 30 of this configuration example, noise is reduced when the drive transmission paths are switched. be able to.

  Further, by setting the number of drive transmission members in the first drive transmission path R1 and the second drive transmission path R2 between the two fixed shafts S1 and S2 to be odd and even, the rotation direction of the motor 1 is changed. Even if it is changed, only the reduction ratio can be changed without changing the rotation direction of the paper discharge roller 181a.

  Further, the drive transmission path can be made quieter by using a timing belt as in the first drive transmission path R1 than in the second drive transmission path R2. it can. On the other hand, it is possible to improve the durability by using only the external gear as in the second drive transmission path R2 than in the case of using a timing belt as in the first drive transmission path R1. Therefore, for example, when the first drive transmission path R1 and the second drive transmission path R2 are configured so that the rotation direction and the reduction ratio of the paper discharge roller 181a are the same, either the quietness or the durability is set. Depending on the method, the drive transmission path may be switchable.

  As shown in FIG. 4, the motor 1 is arranged with respect to the drive device 30 so that the axial direction of the motor 1 is perpendicular to the axial direction of the fixed shaft S1, and the output shaft of the motor 1 is a helical gear. A configuration in which the worm gear 1b is used instead of 1a can also be adopted. Even in this configuration, the direction of the thrust force acting on the idler gear 2 that is the helical gear is changed from the worm gear 1b to the idler gear 2 in the axial direction between the forward rotation and the reverse rotation of the motor 1 as described above. The drive transmission path can be switched by moving in different directions.

  Further, in this configuration example, even if the rotation speed of the motor 1 is the same between the forward rotation and the reverse rotation, the rotation of the motor 1 is controlled by a single control constant, and the rotation speed of the paper discharge roller 181a. Can be increased.

[Configuration example 2]
FIG. 5 is a schematic cross-sectional view of the drive device 30 according to Configuration Example 2. As shown in FIG. 3, the drive device 30 includes a motor 1 that is a drive source capable of forward and reverse rotation, and the motor 11 is attached to the side plate 131. A helical gear 11a is provided on the output shaft of the motor 1, and the helical gear 11a and the idler gear 12 are engaged with each other. The idler gear 12 is rotatably supported by a fixed shaft S1 fixed to the side plate 131 and the side plate 132, and a plurality of drive connection claws 12a and drive connection claws 12b are provided on both side surfaces in the axial direction. A plurality of drive connection holes 18a into which the plurality of drive connection claws 12a are fitted are provided on the rotation track of the drive connection claws 12a on the side surface of the external gear 18 that is rotatably supported by the fixed shaft S1. Is formed. Then, the idler gear 12 moves to the axial external gear 18 side while rotating on the fixed shaft S1, and the idler gear 12 and the external gear 18 are engaged by the drive coupling claw 12a being fitted into the drive coupling hole 18a. It is possible. Further, a plurality of drive connection holes 13a into which the plurality of drive connection claws 12b are fitted are formed on the side surfaces of the external gear 13 that are rotatably supported by the fixed shaft S1, and the rotation orbits of the drive connection claws 12b. Formed on top. Then, the idler gear 12 moves to the axial external gear 13 side while rotating on the fixed shaft S1, and the idler gear 12 and the external gear 13 are engaged by the drive coupling claw 12b fitting into the drive coupling hole 13a. It is possible.

  The fixed shaft S2 is fixed to the side plate 131 and the side plate 132 at a position shifted in the radial direction with respect to the fixed shaft S1 toward the paper discharge roller 181a, and the rotation shaft 7 of the paper discharge roller 181a is provided on the side plate 132. The bearing 132a is rotatably supported. An external gear 14 that meshes with the external gear 13 is rotatably supported on the fixed shaft S2. An external gear 20 that meshes with the external gear 18 coaxially with the external gear 14, and a drive gear 15 that meshes with the external gear 17 fixed to the rotating shaft 7 of the paper discharge roller 181 a by a fixing pin 7 a, It is supported rotatably.

  In the drive device 30 shown in FIG. 5, the first drive transmission path R1 which is one of the two systems of drive transmission paths for transmitting the driving force of the motor 11 to the paper discharge roller 181a is an external tooth which is a drive transmission member. The gear 13 and the external gear 14 are configured. Further, the second drive transmission path R2 which is the other of the two systems of drive transmission paths is constituted by an external gear 18, an external gear 19 and an external gear 20 which are drive transmission members.

  The direction F of the thrust force acting on the idler gear 12 from the helical gear 11a is determined by the rotational direction of the motor 11 and the twisting direction of the helical gear 11a. In FIG. 5, the rotational direction of the motor 11 is the clockwise direction (CW), and the torsional direction of the helical gear 11a is the left, so that a thrust force acts on the idler gear 12 from the helical gear 11a to the external gear 13 side. Therefore, the idler gear 12 moves to the external gear 13 side in the thrust direction, the drive connecting claw 12b fits into the drive connecting hole 13a, and the idler gear 12 and the external gear 13 engage with each other. The gear 13 is driven. The external gear 13 drives an external gear 14 that is rotatably attached to the fixed shaft S2. The drive gear 15 arranged coaxially with the external gear 14 drives the external gear 17 provided on the rotating shaft 7 of the paper discharge roller 181a. Accordingly, the paper discharge roller 181a provided on the rotation shaft 7 rotates in the same direction as the rotation direction of the motor 11 by the driving force transmitted from the first drive transmission path R1.

  FIG. 6 is a schematic cross-sectional view of the drive device 30 at the time of reverse rotation of the motor 11 in which the motor 11 is rotated in the direction opposite to that in FIG. In the drive device 30 shown in FIG. 3, since the motor 11 is driven in the counterclockwise rotation direction, a thrust force acts on the idler gear 12 from the helical gear 11a to the external gear 18 side. Therefore, the idler gear 12 moves to the external gear 18 side in the thrust direction, the drive connecting claw 12a is fitted into the drive connecting hole 18a, and the idler gear 12 and the external gear 18 are engaged, so that the idler gear 12 is externally connected. The gear 18 is driven. The external gear 18 drives an external gear 20 that is arranged coaxially with the fixed shaft S2 via an external gear 19 that is rotatably supported by the fixed shaft S3. The drive gear 15 arranged coaxially with the external gear 20 drives the external gear 17 provided on the rotating shaft 7 of the paper discharge roller 181a. As a result, the paper discharge roller 181a provided on the rotary shaft 7 is driven in the direction opposite to the rotation direction of the motor 11 by the driving force transmitted from the second drive transmission path R2, and the external teeth Driven at a rotational speed different from the reduction ratio of the gear 13 / external gear 14.

  Further, by setting the number of drive transmission members in the first drive transmission path R1 and the second drive transmission path R2 between the two fixed shafts S1 and S2 to be odd and even, the rotation direction of the motor 11 is changed. Even if it is changed, only the reduction ratio can be changed without changing the rotation direction of the paper discharge roller 181a.

  In addition, as in the driving device 30 according to the present configuration example, both the first drive transmission path R1 and the second drive transmission path R2 are configured only by external gears, so that two highly durable drive transmissions are achieved. Drive transmission can be performed along the path, and the life of the drive device 30 can be extended.

[Configuration example 3]
FIG. 7 is a schematic cross-sectional view of the drive device 30 according to Configuration Example 3. As shown in FIG. 7, the drive device 30 includes a motor 21 that is a drive source capable of forward and reverse rotation, and the motor 21 is attached to the side plate 131. A helical gear 21a is provided on the output shaft of the motor 21, and the helical gear 21a and the idler gear 22 are engaged with each other. The idler gear 22 is rotatably supported by a fixed shaft S1 fixed to the side plate 131 and the side plate 132, and a plurality of drive connection claws 22a and drive connection claws 22b are provided on both side surfaces in the axial direction. A plurality of drive connection holes 23a into which a plurality of drive connection claws 22a are fitted are formed on a rotation path of the drive connection claw 22a on a side surface of the internal gear 23 that is rotatably supported by the fixed shaft S1 and faces the idler gear 22. Is formed. Then, the idler gear 22 moves to the axial internal gear 23 side while rotating on the fixed shaft S1, and the drive connection claw 22a is fitted into the drive connection hole 23a, whereby the idler gear 22 and the internal gear 23 are engaged. It is possible. Further, a plurality of drive connection holes 27a into which the plurality of drive connection claws 22b are fitted are provided on the side surfaces of the external gear 27 that are rotatably supported by the fixed shaft S1 so as to fit the drive connection claws 22b. Formed on top. Then, the idler gear 22 moves to the axial external gear 27 side while rotating on the fixed shaft S1, and the drive connection claw 22b is fitted into the drive connection hole 27a, whereby the idler gear 22 and the external gear 27 are engaged. It is possible.

  The fixed shaft S2 is fixed to the side plate 131 at a position shifted in the radial direction with respect to the fixed shaft S1, and the rotation shaft 7 of the paper discharge roller 181a is attached to a bearing 132a provided on the side plate 132. It is supported rotatably. An external gear 28 that meshes with the external gear 27 is rotatably supported on the fixed shaft S2. Also, an external gear 24 that meshes with the external gear 28 coaxially with the internal gear 23, and a drive gear 25 that meshes with the external gear 26 that is fixed to the rotation shaft 7 of the paper discharge roller 181a by the fixing pin 7a. It is supported rotatably.

  In the drive device 30 shown in FIG. 7, the first drive transmission path R1 which is one of the two systems of drive transmission paths for transmitting the driving force of the motor 21 to the paper discharge roller 181a is an external tooth which is a drive transmission member. The gear 27 and the external gear 28 are configured. Further, the second drive transmission path R2 which is the other of the two systems of drive transmission paths is constituted by an internal gear 23 and an external gear 24 which are drive transmission members.

  The direction of the thrust force acting on the idler gear 22 from the helical gear 21a is determined by the rotational direction of the motor 21 and the twisting direction of the helical gear 21a. In FIG. 7, since the twisting direction of the helical gear 11a is on the left, the thrust force acts on the idler gear 22 from the helical gear 21a to the external gear 27 side by driving the motor 21 in the clockwise direction (CW). Therefore, the idler gear 22 moves to the external gear 27 side in the thrust direction, the drive connecting claw 22b is fitted in the drive connecting hole 27a, and the idler gear 22 and the external gear 27 are engaged, so that the idler gear 22 is externally connected. The gear 27 is driven. The external gear 27 drives an external gear 28 that is rotatably attached to the fixed shaft S2. The drive gear 25 arranged coaxially with the external gear 28 drives the external gear 26 provided on the rotating shaft 7 of the paper discharge roller 181a. Accordingly, the paper discharge roller 181a provided on the rotary shaft 7 rotates in the same direction as the rotation direction of the motor 21 by the driving force transmitted from the first drive transmission path R1.

  On the other hand, by driving the motor 21 in the counterclockwise direction (CCW), a thrust force acts on the idler gear 22 from the helical gear 21a to the axial internal gear 23 side. Therefore, the idler gear 22 moves to the internal gear 23 side in the thrust direction, the drive connection claw 22a is fitted in the drive connection hole 23a, and the idler gear 22 and the internal gear 23 are engaged, so that the idler gear 22 is connected to the internal gear. The gear 23 is driven. The internal gear 23 drives an external gear 24 that is rotatably supported by the fixed shaft S2. A drive gear 25 arranged coaxially with the external gear 24 drives an external gear 26 provided on the rotary shaft 7 of the paper discharge roller 181a. As a result, the paper discharge roller 181a provided on the rotary shaft 7 is in a direction opposite to the rotation direction of the motor 21 by the driving force transmitted from the second drive transmission path R2, and the external gear 27 / external gear. It is driven at a rotational speed different from the reduction ratio of the gear 28.

  In addition, like the drive device 30 according to the present configuration example, by configuring the drive transmission path using the internal gear, the meshing portion with the external gear can be covered with the internal gear, and the meshing portion The generated noise can be shielded by the internal gear. Further, the meshing ratio between the external gear and the internal gear can be increased compared with the meshing between the external gears, and the generation of noise and vibration can be suppressed. Thereby, the silence of the drive device 30 can be improved. For this reason, as a drive transmission path using an internal gear, it is preferable to use it for drive transmission with a higher usage frequency and longer usage time.

[Configuration Example 4]
FIG. 8 is a schematic cross-sectional view of the drive device 30 according to Configuration Example 4. As shown in FIG. 8, in the drive device 30, a motor 31 that is a drive source capable of forward and reverse rotation is attached to the side plate 133. An output shaft of the motor 31 is provided with a helical gear 31a. An internal helical gear portion 32a of an idler gear 32 rotatably supported on a fixed shaft S3 fixed to the side plate 131 and the side plate 133, a helical gear 31a, Are engaged. The idler gear 32 is provided with an externally toothed helical gear portion 32b concentrically, and an idler gear 33 which is a helical gear rotatably supported on a fixed shaft S1 fixed to the side plate 131 and the side plate 132, and an externally toothed helical gear. The part 32b is engaged. The idler gear 33 is rotatably supported by a fixed shaft S1 fixed to the side plate 131 and the side plate 132, and a plurality of drive connection claws 33a and drive connection claws 33b are provided on both side surfaces in the axial direction. A plurality of drive connection holes 37a into which the plurality of drive connection claws 33a are fitted on the side surfaces of the external gear 37 that are rotatably supported by the fixed shaft S1 are on the rotation path of the drive connection claws 33a. Is formed. Then, the idler gear 33 moves on the axial external gear 37 side while rotating on the fixed shaft S1, and the idler gear 33 and the external gear 37 are engaged by the drive coupling claw 33a being fitted into the drive coupling hole 37a. It is possible. A plurality of drive connection holes 34a into which the plurality of drive connection claws 33b are fitted are formed on the rotation path of the drive connection claws 33b on the side surface of the pulley 34 that is rotatably supported by the fixed shaft S1. Is formed. Then, the idler gear 33 moves on the axial pulley 34 side while rotating on the fixed shaft S1, and the idler gear 33 and the pulley 34 can be engaged by the drive coupling claw 33b fitting into the drive coupling hole 34a. Yes.

  The fixed shaft S2 is fixed to the side plate 131 and the side plate 132 at a position shifted in the radial direction with respect to the fixed shaft S1 toward the paper discharge roller 181a, and the rotation shaft 7 of the paper discharge roller 181a is provided on the side plate 132. The bearing 132a is rotatably supported. A pulley 36 that stretches a timing belt 35 together with the pulley 34 is rotatably supported on the fixed shaft S2. An external gear 38 that meshes with the external gear 37 coaxially with the pulley 36, and a drive gear 39 that meshes with the external gear 40 that is fixed to the rotary shaft 7 of the paper discharge roller 181a by a fixing pin 7a are freely rotatable. It is supported by.

  In the drive device 30 shown in FIG. 8, the first drive transmission path R1 which is one of the two systems of drive transmission paths for transmitting the driving force of the motor 31 to the paper discharge roller 181a is a pulley 34 which is a drive transmission member. And a timing belt 35 and a pulley 36. Further, the second drive transmission path R2 which is the other of the two systems of drive transmission paths is constituted by an external gear 37 and an external gear 38 which are drive transmission members.

  The motor 31 drives the idler gear 33 through the internal helical gear portion 32 a and the external helical gear portion 32 b of the idler gear 32. Here, the direction of the thrust force acting on the idler gear 33 from the external helical gear portion 32b is determined by the rotational direction of the idler gear 32 and the twisting direction of the external helical gear portion 32b. In FIG. 8, by driving the motor 31 in the counterclockwise direction (CCW), the idler gear 32 rotates counterclockwise via the helical gear 31a, and the idler gear 33 is moved axially outward from the externally toothed helical gear portion 32b. A thrust force works in the direction toward the tooth gear 37. Therefore, the idler gear 33 moves toward the external gear 37 in the thrust direction, the drive connecting claw 33a is fitted in the drive connecting hole 37a, and the idler gear 33 and the external gear 37 are engaged, so that the idler gear 33 is externally connected. The gear 37 is driven. The external gear 37 drives an external gear 38 that is rotatably attached to the fixed shaft S2. A drive gear 39 arranged coaxially with the external gear 38 drives the external gear 40 provided on the rotating shaft 7 of the paper discharge roller 181a. As a result, the paper discharge roller 181a provided on the rotary shaft 7 rotates in the direction opposite to the rotation direction of the motor 31 by the driving force transmitted from the second drive transmission path R2.

  On the other hand, in FIG. 8, when the motor 31 is driven in the clockwise direction (CW), the idler gear 32 rotates in the clockwise direction via the helical gear 31a, and the idler gear 33 has an external pulley from the external helical gear portion 32b. Thrust force works on the 34th side. Therefore, the idler gear 33 moves to the pulley 34 side in the thrust direction, the drive connecting claw 33b is fitted in the drive connecting hole 34a, and the idler gear 33 and the pulley 34 are engaged, so that the idler gear 33 drives the pulley 34. The pulley 34 drives a pulley 36 that is rotatably attached to the fixed shaft S <b> 2 via a timing belt 35. A drive gear 39 arranged coaxially with the pulley 36 drives an external gear 40 provided on the rotary shaft 7 of the paper discharge roller 181a. As a result, the paper discharge roller 181a provided on the rotary shaft 7 is driven in the same direction as the rotation direction of the motor 31 by the driving force transmitted from the first drive transmission path R1, and the external gear 37 / Drived at a rotational speed different from the reduction gear ratio of the external gear 38.

  Further, by changing the number of drive transmission members in the first drive transmission path R1 and the second drive transmission path R2 between the fixed shaft S1 and the fixed shaft S2, the rotation direction of the motor 31 is changed. In addition, only the reduction ratio can be changed without changing the rotation direction of the paper discharge roller 181a.

  Further, the helical gear 31a of the motor 31 does not directly mesh with the idler gear 33, which is an external gear, but meshes with the internal helical gear portion 32a of the idler gear 32, and the internal helical helical gear portion 32a and the external helical gear portion 32b are engaged with each other. Driving is transmitted to the idler gear 33. Thereby, it can mesh | engage with the internal-tooth helical gear part 32a at the base of the helical gear 31a, and it can aim at the improvement of rotation accuracy and reduction of a noise.

  As described above, in the present embodiment, the configuration in which the paper discharge roller 181a is rotationally driven by the driving device 30 as the driven body has been described, but the driven body is not limited to the paper discharge roller 181a. For example, in order to form an image on both sides of the recording paper P, the driving device of each of the above-described configuration examples using the double-sided roller 183 that reverses the front and back of the recording paper P and conveys the refeed path 170 as the driven body. A configuration in which the motor 30 is rotationally driven can also be employed.

[Embodiment 2]
Hereinafter, as an image forming apparatus to which the present invention is applied, another embodiment of an electrophotographic printer (hereinafter simply referred to as a printer) will be described. Note that the basic configuration of the printer according to the present embodiment is the same as the configuration of the printer according to the first embodiment, and a description thereof will be omitted.

  The image forming apparatus transports the paper by a plurality of rollers, but associates the paper feed speeds of the rollers so as not to pull the paper between the rollers or to feed the paper too much. The image forming apparatus corresponding to various paper thicknesses finely adjusts the paper feed speed ratio between the rollers depending on the paper type because the transferability / fixability of the image changes depending on the paper thickness. For this reason, conventionally, a drive source is separately provided for each roller for which the paper feed speed ratio of the roller is desired to be changed. However, the fine adjustment of the speed between the rollers can be easily changed by changing the speed of the motor. However, since the number of motors increases, there are problems of increased cost, increased driving sound, space, and power consumption. Therefore, in a drive device having at least two systems of drive trains and a plurality of rollers from one motor, the motor is provided with a “drive train during normal rotation” and a “drive train during reverse rotation”, and each drive train is decelerated. The paper feed speed ratio between the rollers is changed by finely adjusting the ratio. As a result, the problems of cost increase, increase in driving sound, space, and power consumption, which can be caused by increasing the number of motors as described above, can be solved.

  Specifically, the motor output gear is a helical gear, and the idler gear meshing with the motor output gear is movable in the axial direction. Then, by changing the direction of rotation of the motor, the direction of the thrust force acting on the idler gear from the motor output gear, which is a helical gear, changes, so that a shaft coupling (coupling) of the idler gear can be selected. Since the rotation direction of the motor is changed, the rotation direction from the shaft coupling to the roller is different, such as “change the number of gears”, “gear and belt”, “external gear and internal gear”, etc. Two drive transmission paths are provided. In addition, by changing the reduction ratio, the rotation direction of the rollers can be made the same, and the speed can be finely adjusted.

[Configuration Example 5]
FIG. 9 is a diagram illustrating a drive transmission configuration of the drive device 30 according to Configuration Example 5. The drive device 30 according to the configuration example 5 includes a motor 1 that is a drive source capable of forward and reverse rotation, and the motor 1 is attached to the side plate 131. The output shaft of the motor 41 is provided with a helical gear 41a on the left side in the twist direction, and the helical gear 41a and the idler gear 42 are engaged with each other. The idler gear 42 is rotatably supported by a fixed shaft S1 fixed to the side plate 131 and the side plate 132, and a plurality of drive connection claws 42a and a plurality of drive connection claws 42b are provided on both side surfaces in the axial direction. A plurality of drive connection holes 48a into which the plurality of drive connection claws 42a are fitted are formed on the rotation track of the drive connection claws 42a on the side surface of the external gear 48 that is rotatably supported by the fixed shaft S1. Is formed. Then, the idler gear 42 moves to the axial external gear 48 side while rotating on the fixed shaft S1, and the idler gear 42 and the external gear 48 are engaged by the drive coupling claw 42a fitting into the drive coupling hole 48a. It is possible. A plurality of drive connection holes 43a into which the plurality of drive connection claws 42b are fitted are formed on the rotation path of the drive connection claws 42b on the side surface of the pulley 43 that is rotatably supported by the fixed shaft S1. Is formed. Then, the idler gear 42 moves to the axial pulley 43 side while rotating on the fixed shaft S1, and the drive connection claw 42b fits into the drive connection hole 43a, whereby the idler gear 42 and the pulley 43 can be engaged. Yes.

  The fixed shaft S2 is fixed to the side plate 131 and the side plate 132 at a position shifted in the radial direction with respect to the fixed shaft S1 to the registration roller 143a, and the bearing 132a provided with the rotation shaft of the registration roller 143a is provided on the side plate 132. Is supported rotatably. A pulley 45 that stretches the timing belt 44 together with the pulley 43 is rotatably supported on the fixed shaft S2, and a drive gear 46 that is coaxial with the pulley 45 and meshes with the external gear 48 is rotatably supported. Yes. The drive gear 46 meshes with an external gear 47 fixed to the rotation shaft 49 of the registration roller 143a by a fixed pin 49a.

  In the drive device 30 shown in FIG. 9, the first drive transmission path Rs1 which is one of the two systems of drive transmission paths for transmitting the driving force of the motor 41 to the registration rollers 143a is connected to the pulley 43 which is a drive transmission member. A timing belt 44 and a pulley 45 are included. Further, the second drive transmission path Rs2 which is the other of the two systems of drive transmission paths is constituted by an external gear 48 and a drive gear 46 which are drive transmission members.

  The helical gear 41a meshes with the idler gear 52. The idler gear 52 is rotatably supported by a fixed shaft t1 fixed to the side plate 131 and the side plate 132, and a plurality of drive connection claws 52a and drive connection claws 52b are provided on both side surfaces in the axial direction. A plurality of drive connection holes 58a into which the plurality of drive connection claws 52a are fitted are formed on the rotation track of the drive connection claws 52a on the side surface of the external gear 58 that is rotatably supported by the fixed shaft t1 and faces the idler gear 52. Is formed. The idler gear 52 moves to the axial external gear 58 side while rotating on the fixed shaft t1, and the idler gear 52 and the external gear 58 are engaged with each other by the drive coupling claw 52a being fitted into the drive coupling hole 58a. It is possible. A plurality of drive connection holes 53a into which a plurality of drive connection claws 52b are fitted are formed on a rotation path of the drive connection claws 52b on a side surface of the pulley 53 that is rotatably supported by the fixed shaft t1. Is formed. The idler gear 52 moves to the axial pulley 53 side while rotating on the fixed shaft t1, and the idler gear 52 and the pulley 53 can be engaged with each other by the drive coupling claw 52b fitting into the drive coupling hole 53a. Yes.

  The fixed shaft t2 is fixed to the side plate 131 and the side plate 132 at a position shifted in the radial direction with respect to the fixed shaft t1 to the fixing roller 145 side, and a bearing 132b provided with the rotation shaft of the fixing roller 145 on the side plate 132. Is supported rotatably. A pulley 55 that stretches the timing belt 54 together with the pulley 53 is rotatably supported on the fixed shaft t2, and a drive gear 56 that is coaxial with the pulley 55 and meshes with the external gear 58 is rotatably supported. Yes. The drive gear 56 meshes with an external gear 57 fixed to the rotation shaft 59 of the fixing roller 145 with a fixing pin 59a.

  In the drive device 30 shown in FIG. 9, the first drive transmission path Rt1 which is one of the two systems of drive transmission paths for transmitting the driving force of the motor 41 to the fixing roller 145 is connected to the pulley 53 which is a drive transmission member. A timing belt 54 and a pulley 55 are included. Further, the second drive transmission path Rt2 which is the other of the two systems of drive transmission paths is constituted by an external gear 58 and a drive gear 56 which are drive transmission members.

  In FIG. 9, by driving the motor 41 in the clockwise direction (CW), a thrust force acts on the idler gear 42 from the helical gear 41a to the axial pulley 43 side. Therefore, the idler gear 42 moves to the pulley 43 side in the thrust direction, the drive connecting claw 42b is fitted into the drive connecting hole 43a, and the idler gear 42 and the pulley 43 are engaged, whereby the idler gear 42 drives the pulley 43. The pulley 43 drives a pulley 45 that is rotatably attached to the fixed shaft S <b> 2 via the timing belt 44. The drive gear 46 disposed coaxially with the pulley 45 drives the external gear 47 provided on the rotation shaft 49 of the registration roller 143a. As a result, the registration roller 143a provided on the rotation shaft 49 rotates in the same direction as the rotation direction of the motor 41 by the driving force transmitted from the first drive transmission path Rs1.

  Further, by driving the motor 41 in the clockwise rotation direction, a thrust force acts on the idler gear 52 from the helical gear 41a to the axial pulley 53 side. Therefore, the idler gear 52 moves to the pulley 53 side in the thrust direction, the drive connecting claw 52b is fitted into the drive connecting hole 53a, and the idler gear 52 and the pulley 53 are engaged, so that the idler gear 52 drives the pulley 53. The pulley 53 drives a pulley 55 that is rotatably attached to the fixed shaft t <b> 2 via the timing belt 54. The drive gear 56 disposed coaxially with the pulley 55 drives the external gear 57 provided on the rotation shaft 59 of the fixing roller 145. Accordingly, the fixing roller 145 provided on the rotation shaft 59 rotates in the same direction as the rotation direction of the motor 41 by the driving force transmitted from the first drive transmission path Rt1.

  On the other hand, in FIG. 9, by driving the motor 41 in the counterclockwise direction (CCW), a thrust force acts on the idler gear 42 from the helical gear 41a to the axial external gear 48 side. Therefore, the idler gear 42 moves to the external gear 48 side in the thrust direction, the drive connection claw 42a is fitted in the drive connection hole 48a, and the idler gear 42 and the external gear 48 are engaged, so that the idler gear 42 is externally connected. The gear 48 is driven. The external gear 48 drives the drive gear 46 arranged coaxially with the pulley 45, so that the external gear 47 provided on the rotation shaft 49 of the registration roller 143 a is driven by the drive gear 46. . Thereby, the registration roller 143a provided on the rotation shaft 49 is in a direction opposite to the rotation direction of the motor 41 by the driving force transmitted from the second drive transmission path Rs2, and the reduction ratio of the pulley 43 / pulley 45 It is driven at a different rotational speed.

  Further, by driving the motor 41 counterclockwise, a thrust force acts on the idler gear 52 from the helical gear 41a toward the axial external gear 58 side. Therefore, the idler gear 52 moves to the external gear 58 side in the thrust direction, the drive connecting claw 52a is fitted into the drive connecting hole 58a, and the idler gear 52 and the external gear 58 are engaged, so that the idler gear 52 is externally connected. The gear 58 is driven. The external gear 58 drives the drive gear 56 disposed coaxially with the pulley 55, so that the external gear 57 provided on the rotation shaft 59 of the fixing roller 145 is driven by the drive gear 56. . As a result, the fixing roller 145 provided on the rotation shaft 59 is in a direction opposite to the rotation direction of the motor 41 by the driving force transmitted from the second drive transmission path Rt2, and the reduction ratio of the pulley 53 / pulley 55. It is driven at a different rotational speed.

  In the drive device 30 according to this configuration example, as described above, the reduction ratio is set between the drive transmission path when the rotation direction of the motor 41 is clockwise and the drive transmission path when the rotation direction is counterclockwise. Make it different. Thereby, the ratio of the rotational speeds of the registration roller 143a and the fixing roller 145 can be changed depending on whether the rotation direction of the motor 41 is clockwise or counterclockwise. Therefore, the speed of the registration roller 143a and the fixing roller 145 can be finely adjusted by the single motor 41 without providing two motors corresponding to each of the registration roller 143a and the fixing roller 145. Can be achieved. It is desirable that the difference in the reduction ratio between the registration roller 143a and the fixing roller 145 is 3% or less. Thereby, the fine adjustment of the speed between the two rollers can be performed at 3 [%] or less.

[Configuration Example 6]
FIG. 10 is a diagram illustrating a drive transmission configuration of the drive device 30 according to Configuration Example 6. The drive device 30 according to the configuration example 6 includes a motor 61 that is a drive source capable of forward and reverse rotation, and the motor 61 is attached to the side plate 131. The output shaft of the motor 31 is provided with a helical gear 61a on the left in the twist direction, and the helical gear 61a and the idler gear 62 are engaged with each other. The idler gear 62 is rotatably supported by a fixed shaft S1 fixed to the side plate 131 and the side plate 132, and a plurality of drive connection claws 62a and drive connection claws 62b are provided on both side surfaces in the axial direction. A plurality of drive connection holes 68a into which the plurality of drive connection claws 62a are fitted are formed on the rotation track of the drive connection claws 62a on the side surface of the pulley 68 that is rotatably supported by the fixed shaft S1. ing. Then, the idler gear 62 moves to the axial pulley 68 side while rotating on the fixed shaft S1, and the drive connection claw 62a is fitted into the drive connection hole 68a, so that the idler gear 62 and the pulley 68 can be engaged. Yes. A plurality of drive connection holes 63a into which the plurality of drive connection claws 62b are fitted are provided on the side surfaces of the external gear 63 that are rotatably supported on the fixed shaft S1 and that face the idler gears 62. Formed on top. Then, the idler gear 62 moves on the axial external gear 63 side while rotating on the fixed shaft S1, and the idler gear 62 and the external gear 63 are engaged by the drive coupling claw 62b fitting into the drive coupling hole 63a. It is possible.

  The fixed shaft S2 and the fixed shaft S3 are fixed to the side plate 131 and the side plate 132 at a position shifted in the radial direction with respect to the fixed shaft S1 to the registration roller 143a, and the rotation shaft of the registration roller 143a is fixed to the side plate 132. The bearing 132a provided is rotatably supported. A pulley 70 that stretches a timing belt 69 together with a pulley 68 is rotatably supported on the fixed shaft S2. An external gear 64 that is coaxial with the pulley 70 and meshes with the external gear 63 and an external gear 65 that is positioned between the pulley 70 and the external gear 64 in the axial direction are rotatable about the fixed shaft S2. It is supported by. A drive gear 66 that meshes with the external gear 65 is rotatably supported on the fixed shaft S3. The drive gear 66 is further external gear that is fixed to the rotary shaft 49 of the registration roller 143a by a fixed pin 49a. Is engaged with 67.

  In the drive device 30 shown in FIG. 10, the first drive transmission path Rs1 which is one of the two systems of drive transmission paths for transmitting the driving force of the motor 61 to the registration rollers 143a is an external gear which is a drive transmission member. 63 and an external gear 64. Further, the second drive transmission path Rs2 which is the other of the two systems of drive transmission paths is constituted by a pulley 68, a timing belt 69 and a pulley 70 which are drive transmission members.

  Further, the helical gear 61a and the idler gear 72 are engaged with each other. The idler gear 72 is rotatably supported by a fixed shaft t1 fixed to the side plate 131 and the side plate 132, and a plurality of drive connection claws 72a and a plurality of drive connection claws 72b are provided on both side surfaces in the axial direction. A plurality of drive connection holes 78a into which the plurality of drive connection claws 72a are fitted are formed on the rotation path of the drive connection claw 72a on the side surface of the external gear 78 that is rotatably supported by the fixed shaft t1. Is formed. Then, the idler gear 72 moves to the axial pulley 78 side while rotating on the fixed shaft t1, and the drive connection claw 72a is fitted into the drive connection hole 78a, so that the idler gear 72 and the external gear 78 can be engaged. It has become. A plurality of drive connection holes 73a into which the plurality of drive connection claws 72b are fitted are provided on the side surfaces of the external gear 73 that are rotatably supported on the fixed shaft t1 and that are engaged with the idler gear 72. Formed on top. Then, the idler gear 72 moves on the axial external gear 73 side while rotating on the fixed shaft t1, and the idler gear 72 and the external gear 73 are engaged by the drive coupling claw 72b being fitted into the drive coupling hole 73a. It is possible.

  The fixed shaft t2 and the fixed shaft t3 are fixed to the side plate 131 and the side plate 132 at a position shifted to the fixing roller 145 side in the radial direction with respect to the fixed shaft S1, and the rotation shaft of the fixing roller 145 is attached to the side plate 132. The bearing 132b provided is rotatably supported. An external gear 74 that meshes with the external gear 73 is rotatably supported on the fixed shaft t3. An external gear 75 that meshes with the external gear 74 is rotatably supported on the fixed shaft t2, and a drive gear 76 that is coaxial with the external gear 75 and meshes with the external gear 78 is rotatably supported. . The drive gear 76 is also meshed with an external gear 77 fixed to the rotation shaft 59 of the fixing roller 145 with a fixing pin 59a.

  In the drive device 30 shown in FIG. 10, the first drive transmission path Rt1 which is one of two drive transmission paths for transmitting the driving force of the motor 61 to the fixing roller 145 is an external gear which is a drive transmission member. 73, an external gear 74, and an external gear 75. Further, the second drive transmission path Rt2 which is the other of the two systems of drive transmission paths is configured by an external gear 78 and a drive gear 76 which are drive transmission members.

  In FIG. 10, by driving the motor 61 in the clockwise direction (CW), a thrust force acts on the idler gear 62 from the helical gear 61a to the axial external gear 63 side. Therefore, the idler gear 62 moves to the external gear 63 side in the thrust direction, the drive connection claw 62b is fitted into the drive connection hole 63a, and the idler gear 62 and the external gear 63 are engaged, so that the idler gear 62 is externally connected. The gear 63 is driven. The pulley 43 drives a pulley 45 that is rotatably attached to the fixed shaft S <b> 2 via the timing belt 44. The drive gear 46 disposed coaxially with the pulley 45 drives the external gear 47 provided on the rotation shaft 49 of the registration roller 143a. The external gear 63 drives an external gear 64 that is rotatably attached to the fixed shaft S2. Then, the drive gear 66 is driven through the external gear 65 arranged coaxially with the external gear 64, and the drive gear 66 drives the external gear 67 provided on the rotation shaft 49 of the registration roller 143a. . As a result, the registration roller 143a provided on the rotation shaft 49 rotates in the same direction as the rotation direction of the motor 61 by the driving force transmitted from the first drive transmission path Rs1.

  Further, by driving the motor 61 in the clockwise rotation direction, a thrust force acts on the idler gear 72 from the helical gear 61a to the axial external gear 73 side. Therefore, the idler gear 72 moves to the external gear 73 side in the thrust direction, the drive connecting claw 72b is fitted into the drive connecting hole 73a, and the idler gear 72 and the external gear 73 are engaged, so that the idler gear 72 is externally connected. The gear 73 is driven. The pulley 53 drives a pulley 55 that is rotatably attached to the fixed shaft t <b> 2 via the timing belt 54. The drive gear 56 disposed coaxially with the pulley 55 drives the external gear 57 provided on the rotation shaft 59 of the fixing roller 145. The idler gear 72 moves to the external gear 73 side, the drive connecting claw 72b is fitted into the drive connecting hole 73a, and the idler gear 72 and the external gear 73 are engaged, so that the idler gear 72 drives the external gear 73. . The external gear 73 drives an external gear 75 that is rotatably attached to the fixed shaft t2 via an external gear 74 that is rotatably attached to the fixed shaft t3. Then, the drive gear 76 arranged coaxially with the external gear 75 is driven, and the drive gear 76 drives the external gear 77 provided on the rotation shaft 59 of the fixing roller 145. As a result, the fixing roller 145 provided on the rotating shaft 59 rotates in the same direction as the rotation direction of the motor 61 by the driving force transmitted from the first drive transmission path Rt1.

  On the other hand, in FIG. 10, by driving the motor 61 in the counterclockwise direction (CCW), a thrust force acts on the idler gear 62 from the helical gear 61a to the axial pulley 68 side. Therefore, the idler gear 62 moves to the pulley 68 side in the thrust direction, the drive connection claw 62a is fitted in the drive connection hole 68a, and the idler gear 62 and the pulley 68 are engaged, so that the idler gear 62 drives the pulley 68. The pulley 68 drives a pulley 70 that is rotatably attached to the fixed shaft S <b> 2 via the timing belt 69. Then, the drive gear 66 is driven via the external gear 65 arranged coaxially with the pulley 70, and the drive gear 66 drives the external gear 67 provided on the rotation shaft 49 of the registration roller 143a. Thereby, the registration roller 143a provided on the rotation shaft 49 is in the direction opposite to the rotation direction of the motor 61 by the driving force transmitted from the second drive transmission path Rs2, and the external gear 63 / external gear. It is driven at a rotational speed different from the reduction ratio of 65.

  Further, by driving the motor 61 counterclockwise, a thrust force is exerted on the idler gear 72 from the helical gear 61a to the axial external gear 78 side. Therefore, the idler gear 72 moves to the external gear 78 side in the thrust direction, the drive connecting claw 72a is fitted in the drive connecting hole 78a, and the idler gear 72 and the external gear 78 are engaged, so that the idler gear 72 is externally connected. The gear 78 is driven. The external gear 78 drives a drive gear 76 that is rotatably attached to the fixed shaft t2. Then, the drive gear 76 drives the external gear 77 provided on the rotation shaft 59 of the fixing roller 145. Accordingly, the fixing roller 145 provided on the rotation shaft 59 is in a direction opposite to the rotation direction of the motor 61 by the driving force transmitted from the second drive transmission path Rt2, and the external gear 73 / the external gear. It is driven at a rotational speed different from the reduction ratio of 75.

  Between the fixed shaft S1 and the fixed shaft S2, the number of drive transmission members such as gears, pulleys, timing belts, and the like is different between the first drive transmission path Rs1 and the second drive transmission path Rs2. Therefore, even if the rotation direction of the motor 61 is changed, only the reduction ratio can be changed without changing the rotation direction of the paper discharge roller 181a. Further, between the fixed shaft t1 and the fixed shaft t2, the number of the drive transmission members is different between the first drive transmission path Rt1 and the second drive transmission path Rt2 between the odd number and the even number. Therefore, even if the rotation direction of the motor 61 is changed, only the reduction ratio can be changed without changing the rotation direction of the fixing roller 145. Therefore, in the driving device 30 according to this configuration example, even if the rotation direction of the motor 61 is changed, the rotation directions of the registration roller 143a and the fixing roller 145 are not changed, and only the reduction ratio can be finely adjusted.

[Configuration Example 7]
FIG. 11 is a diagram illustrating a drive transmission configuration of the drive device 30 according to Configuration Example 7. In the drive device 30 according to the configuration example 7, a motor 81 that is a drive source capable of forward and reverse rotation is attached to the side plate 133. A motor gear 81a is provided on the output shaft of the motor 81. An internal toothed gear portion 82a of an idler gear 82 rotatably supported on a fixed shaft S3 fixed to the side plate 131 and the side plate 133, and a motor gear 81a. Are engaged. The idler gear 82 includes an externally toothed helical gear portion 82b concentrically, and an idler gear 83 which is a helical gear rotatably supported on a fixed shaft S1 fixed to the side plate 131 and the side plate 132, and an externally toothed helical gear. The portion 82b is engaged with the portion 82b.

  The idler gear 83 is provided with a plurality of drive connection claws 83a and drive connection claws 83b on both side surfaces in the axial direction. A plurality of drive connection holes 84a into which the plurality of drive connection claws 83a are fitted are formed on the rotation track of the drive connection claws 83a on the side surface of the external gear 84 that is rotatably supported by the fixed shaft S1 and that faces the idler gear 83. Is formed. Then, the idler gear 83 moves to the axial external gear 84 side while rotating on the fixed shaft S1, and the idler gear 83 and the external gear 84 are engaged by the drive coupling claw 83a being fitted into the drive coupling hole 84a. It is possible. A plurality of drive connection holes 86a into which the plurality of drive connection claws 83b are fitted are formed on the rotation path of the drive connection claws 83b on the side surface of the pulley 86 that is rotatably supported by the fixed shaft S1. Is formed. Then, the idler gear 83 moves to the axial pulley 86 side while rotating on the fixed shaft S1, and the idler gear 83 and the pulley 86 can be engaged with each other by fitting the drive coupling claw 83b into the drive coupling hole 86a. Yes.

  The fixed shaft S2 is fixed to the side plate 131 and the side plate 132 at a position shifted in the radial direction with respect to the fixed shaft S1 toward the paper discharge roller 181a, and the rotation shaft 7 of the paper discharge roller 181a is provided on the side plate 132. The bearing 132a is rotatably supported. A pulley 88 that stretches a timing belt 87 together with a pulley 86 is rotatably supported on the fixed shaft S <b> 2, and a drive gear 85 that is coaxial with the pulley 88 and meshes with an external gear 84 is rotatably supported. Yes. The drive gear 85 is also meshed with an external gear 89 fixed to the rotating shaft 7 of the paper discharge roller 181a by a fixing pin 7a.

  In the drive device 30 shown in FIG. 11, the first drive transmission path Rs1 which is one of the two systems of drive transmission paths for transmitting the driving force of the motor 81 to the paper discharge roller 181a is a pulley 86 which is a drive transmission member. And a timing belt 87 and a pulley 88. Further, the second drive transmission path Rs2 which is the other of the two systems of drive transmission paths is constituted by an external gear 84 and a drive gear 85 which are drive transmission members.

  Further, the externally toothed helical gear portion 82b of the idler gear 82 meshes with an idler gear 93 that is a helical gear. The idler gear 93 is provided with a plurality of drive connection claws 93a and drive connection claws 93b on both side surfaces in the axial direction. A plurality of drive connection holes 94a into which the plurality of drive connection claws 93a are fitted on the side surfaces of the external gear 94 that are rotatably supported by the fixed shaft t1 are on the rotation path of the drive connection claws 93a. Is formed. Then, the idler gear 93 moves on the axial external gear 94 side while rotating on the fixed shaft t1, and the drive connection claw 93a is fitted into the drive connection hole 94a, whereby the idler gear 93 and the external gear 94 are engaged. It is possible. A plurality of drive connection holes 96a into which the plurality of drive connection claws 93b are fitted are formed on the rotation path of the drive connection claw 93b on the side surface of the pulley 96 that is rotatably supported by the fixed shaft t1. Is formed. Then, the idler gear 93 moves on the axial pulley 96 side while rotating on the fixed shaft t1, and the drive connecting claw 93b fits into the drive connecting hole 96a so that the idler gear 93 and the pulley 96 can be engaged. Yes.

  The fixed shaft t2 is fixed to the side plate 131 and the side plate 132 at a position shifted in the radial direction with respect to the fixed shaft t1 to the fixing roller 145 side, and the rotation shaft of the fixing roller 145 is a bearing 132a provided on the side plate 132. Is supported rotatably. A pulley 98 that stretches a timing belt 97 together with a pulley 96 is rotatably supported on the fixed shaft t2, and a drive gear 95 that is coaxial with the pulley 98 and meshes with an external gear 94 is rotatably supported. Yes. The drive gear 95 is also meshed with an external gear 99 fixed to the rotation shaft 59 of the fixing roller 145 with a fixing pin 59a.

  In the drive device 30 shown in FIG. 11, the first drive transmission path Rt1 which is one of the two systems of drive transmission paths for transmitting the driving force of the motor 81 to the fixing roller 145 includes a pulley 96 which is a drive transmission member. A timing belt 97 and a pulley 98 are included. Further, the second drive transmission path Rt2 which is the other of the two systems of drive transmission paths is configured by an external gear 94 and a drive gear 95 which are drive transmission members.

  The motor 81 drives the idler gear 83 via the internal gear helical gear portion 82a and the external gear helical gear portion 82b of the idler gear 82. Here, the direction of the thrust force acting on the idler gear 83 from the external helical gear portion 82b is determined by the rotational direction of the idler gear 82 and the twisting direction of the external helical gear portion 82b. In FIG. 8, when the motor 81 is driven in the clockwise direction (CW), the idler gear 82 rotates in the clockwise direction via the motor gear 81a, and the idler gear 83 is connected to the axial pulley 86 side from the external helical gear portion 82b. Thrust force works in the direction of. Therefore, the idler gear 83 moves to the pulley 86 side in the thrust direction, the drive connecting claw 83b is fitted into the drive connecting hole 86a, and the idler gear 83 and the pulley 86 are engaged, so that the idler gear 83 drives the pulley 86. The pulley 86 drives a pulley 88 that is rotatably attached to the fixed shaft S <b> 2 via the timing belt 87. A drive gear 85 arranged coaxially with the pulley 88 drives an external gear 89 provided on the rotating shaft 7 of the paper discharge roller 181a. Accordingly, the paper discharge roller 181a provided on the rotation shaft 7 rotates in the same direction as the rotation direction of the motor 81 by the driving force transmitted from the first drive transmission path Rs1.

  The idler gear 82 meshes with the idler gear 93. By driving the motor 81 in the clockwise direction, the idler gear 82 rotates in the clockwise direction via the motor gear 81a, and a thrust force acts on the idler gear 93 in the direction from the external helical gear portion 82b to the axial pulley 96 side. . Therefore, the idler gear 93 moves to the pulley 96 side in the thrust direction, the drive connecting claw 93b is fitted into the drive connecting hole 96a, and the idler gear 93 and the pulley 96 are engaged, whereby the idler gear 93 drives the pulley 96. The pulley 96 drives a pulley 98 that is rotatably attached to the fixed shaft t <b> 2 via the timing belt 97. A drive gear 95 disposed coaxially with the pulley 98 drives an external gear 99 provided on the rotation shaft 59 of the fixing roller 145. As a result, the fixing roller 145 provided on the rotation shaft 59 rotates in the same direction as the rotation direction of the motor 81 by the driving force transmitted from the first drive transmission path Rt1.

  On the other hand, in FIG. 11, by driving the motor 81 counterclockwise (CCW), the idler gear 82 rotates counterclockwise via the motor gear 81a, and the idler gear 83 has a shaft from the external helical gear portion 82b. A thrust force acts in the direction toward the direction external gear 84. Therefore, the idler gear 83 moves to the external gear 84 side in the thrust direction, the drive connection claw 83a is fitted in the drive connection hole 84a, and the idler gear 83 and the external gear 84 are engaged, so that the idler gear 83 is externally connected. The gear 84 is driven. The external gear 84 drives the drive gear 85 arranged coaxially with the pulley 88, so that the external gear 89 provided on the rotation shaft 7 of the paper discharge roller 181a is driven by the drive gear 85. The Thereby, the discharge roller 181a provided on the rotary shaft 7 is decelerated by the pulley 86 / pulley 88 in the direction opposite to the rotation direction of the motor 81 by the driving force transmitted from the second drive transmission path Rs2. Driven at a different speed than the ratio.

  Further, by rotating the idler gear 82 counterclockwise, a thrust force acts on the idler gear 93 in the direction from the external helical gear portion 82b toward the axial external gear 94. Therefore, the idler gear 93 moves to the external gear 94 side in the thrust direction, the drive connection claw 93a is fitted in the drive connection hole 94a, and the idler gear 93 and the external gear 94 engage with each other. The gear 94 is driven. Then, the external gear 94 drives the drive gear 95 disposed coaxially with the pulley 98, so that the external gear 99 provided on the rotation shaft 59 of the fixing roller 145 is driven by the drive gear 95. . As a result, the fixing roller 145 provided on the rotation shaft 59 is in a direction opposite to the rotation direction of the motor 81 by the driving force transmitted from the second drive transmission path Rt2, and the reduction ratio of the pulley 96 / pulley 98. It is driven at a different rotational speed.

  In the drive device 30 according to this configuration example, the motor gear 81a of the motor 81 is not directly meshed with the idler gears 83 and 93 that are external gears, but meshed with the internal toothed helical gear portion 82a of the idler gear 82. The drive is transmitted from the motor gear 81a to the idler gears 83 and 93 via the internal toothed helical gear portion 82a and the externally toothed helical gear portion 82b. Thereby, it can mesh with the internal-tooth helical gear portion 82a at the root of the motor gear 81a, and it is possible to improve the rotation accuracy and reduce the noise.

What was demonstrated above is an example, and there exists an effect peculiar for every following aspect.
(Aspect A)
A driving source such as a motor 1 capable of normal rotation and reverse rotation, an input side rotating member such as a rotatable Hasuba gear 1a to which a rotational driving force is input from the driving source, and a driven body such as a paper discharge roller 181a. An output-side rotating member such as a rotatable external gear 8 that outputs a rotational driving force; two systems of drive transmission paths for transmitting the rotational driving force from the input-side rotating member to the output-side rotating member; In a drive device such as the drive device 30 that includes a drive transmission path switching unit that switches a drive transmission path from the input side rotation member to the output side rotation member, the drive transmission path switching unit is configured to rotate the drive source during normal rotation. And during reverse rotation, the two systems of drive transmission paths move in different directions in the thrust direction, and the one of the two systems of drive transmission paths or the other drive transmission path is Having a moving rotary member such as a rotatable idler gear 2 for transmitting a rotational driving force from the moving source.
In (Aspect A), the input rotation is performed by moving the moving rotary member in a different direction of the thrust direction between the two drive transmission paths during forward rotation and reverse rotation of the drive source. The drive transmission path from the member to the output side rotating member can be switched. That is, the moving rotator having a function of transmitting the rotational driving force from the drive source to each drive transmission path is also used as a member for selectively switching between the two systems of drive transmission paths. Therefore, in addition to the gear for transmitting the rotational driving force from the drive source to each drive transmission path, the one-way clutch is not provided in comparison with the configuration in which the one-way clutch for selectively switching the two drive transmission paths is provided. The increase in cost can be suppressed.
(Aspect B)
In (Aspect A), the moving rotation member has a helical gear portion, and when the drive source is rotated forward, the moving rotation member moves toward one end side in the thrust direction, and the one drive transmission is performed. The rotation drive transmission member is engaged with a first drive transmission member such as a pulley 3 provided in a path to transmit drive from the moving rotation member to the first drive transmission member and reverse the drive source. Moves toward the other end side in the thrust direction, engages with a second drive transmission member such as an external gear 9 provided in the other drive transmission path, and moves from the moving rotation member to the second drive transmission member. Drive is transmitted. According to this, as described in the above embodiment, by changing the rotation direction of the drive source, the direction of the thrust force acting on the moving rotating member changes, and the moving rotating member moves in the thrust direction. The drive transmission path can be switched by changing.
(Aspect C)
In (Aspect A) or (Aspect B), an internal gear such as an internal helical gear portion 32a meshing with an output gear member such as a helical gear 31a provided on the output shaft of the drive source, and coaxial with the internal gear And an external helical gear such as an external helical gear 32b that rotates integrally with the internal gear, and the movable rotating member and the external helical gear mesh with each other. According to this, as described in the above embodiment, it is possible to improve the quietness.
(Aspect D)
In any one of (Aspect A) to (Aspect C), the two-system drive transmission path includes a drive transmission path in which rotation directions of the input-side rotation member and the output-side rotation member are the same, and the input side This is a drive transmission path in which the rotation directions of the rotation member and the output side rotation member are reversed. According to this, as described in the above embodiment, the rotation direction of the driven body can be made the same regardless of the rotation direction of the drive source.
(Aspect E)
In (Aspect A) to (Aspect D), one of the two systems of drive transmission paths is configured to perform drive transmission using a belt member that is rotatably stretched by a plurality of pulleys, The other is configured to perform drive transmission with a gear train in which a plurality of gear members are engaged. According to this, as described in the above embodiment, it is possible to make the rotation direction of the driven body the same regardless of the rotation direction of the drive source.
(Aspect F)
In (Aspect A) to (Aspect D), one of the two systems of drive transmission paths has an even number of drive transmission members, and the other has an odd number of drive transmission members. According to this, as described in the above embodiment, it is possible to make the rotation direction of the driven body the same regardless of the rotation direction of the drive source.
(Aspect G)
In (Aspect A) to (Aspect D), one of the two systems of drive transmission paths is configured to perform drive transmission using an internal gear, and the other is configured to transmit drive using only an external gear. Configured to do. According to this, as described in the above embodiment, it is possible to make the rotation direction of the driven body the same regardless of the rotation direction of the drive source.
(Aspect H)
In (Aspect A) to (Aspect G), the reduction ratios of the two drive transmission paths are different. According to this, as described in the above embodiment, the speed can be increased.
(Aspect I)
In (Aspect A) to (Aspect H), the rotational speed is the same when the drive source is rotating forward and when it is rotating backward. According to this, as described in the above embodiment, the rotation of the drive source can be controlled with a single control constant.
(Aspect J)
In (Aspect A) to (Aspect I), of the two systems of drive transmission paths, the drive transmission path positioned on the drive source side in the thrust direction is positioned on the opposite side of the drive source in the thrust direction. The drive time is longer or more frequently used than the transmission path. According to this, durability can be improved.
(Aspect K)
In (Aspect A) to (Aspect J), the drive transmission path having the smaller number of drive transmission members in the two systems of the drive transmission paths is longer or more frequently used than the other. According to this, noise reduction can be achieved.
(Aspect L)
In (Aspect A) to (Aspect K), a plurality of the two systems of drive transmission paths are provided corresponding to the plurality of driven bodies, and each of the two systems of drive transmission is performed by the rotational driving force from the drive source. Each driven body is driven through a path, and a reduction ratio of at least two driven bodies among the plurality of driven bodies is different between forward rotation and reverse rotation of the drive source. According to this, as described in the above embodiment, the rotational speeds of the two driven bodies can be finely adjusted by changing the rotation direction of the drive source.
(Aspect M)
In (Aspect L), the rotational speed is changed between forward rotation and reverse rotation of the drive source. According to this, it is possible to significantly change the rotation speeds of the two driven bodies without significantly increasing the rotation speed of the drive source.
(Aspect N)
In (Aspect L) or (Aspect M), the difference in the reduction ratio is 3% or less. According to this, the fine adjustment of the speed between the two driven bodies can be performed at 3 [%] or less.
(Aspect O)
In an image forming apparatus including an image forming unit that forms an image and a driving unit that drives a driven body by transmitting a driving force, the driving unit is any one of (Aspect A) to (Aspect N). The described drive device was used. According to this, as described in the above embodiment, the rotational speed of the driven body can be changed without significantly increasing the rotational speed of the drive source.
(Aspect P)
In (Aspect O), a discharge roller such as a discharge roller 181 a for discharging a recording medium such as the recording paper P to a discharge portion such as the stack unit 150 can be used as the driven body.
(Aspect Q)
In (Aspect O), as the driven body, a double-sided roller such as a double-sided roller 183 for conveying the recording medium with its front and back reversed in order to form an image on both sides of the recording medium can be used.
(Aspect R)
In (Aspect O), a fixing roller such as the fixing roller 145 and a registration roller such as the registration roller 143a can be used as the plurality of driven bodies.
(Aspect S)
In (Aspect O), a fixing roller such as a fixing roller 145 and a paper discharge roller such as a paper discharge roller 181a can be used as the plurality of driven bodies.

DESCRIPTION OF SYMBOLS 1 Motor 1a Hasuba gear 1b Worm gear 2 Idler gear 2a Drive connection claw 2b Drive connection claw 3 Pulley 3a Drive connection hole 4 Timing belt 5 Pulley 6 Drive gear 7 Rotating shaft 7a Fixed pin 8 External gear 9 External gear 9a Drive connection hole 10 Outside Toothed gear 11 Motor 11a Hasuba gear 12 Idler gear 12a Drive connection claw 12b Drive connection claw 13 External gear 13a Drive connection hole 14 External gear 15 Drive gear 17 External gear 18 External gear 18a Drive connection hole 19 External gear 20 External tooth Gear 21 motor 21a helical gear 22 idler gear 22a drive connection claw 22b drive connection claw 23 internal gear 23a drive connection hole 24 external gear 25 drive gear 26 external gear 27 external gear 27a drive connection hole 28 external gear 30 drive device 31 Motor 31a Lotus Gear 32 Idler gear 32a Internal toothed helical gear part 32b Externally toothed helical gear part 33 Idler gear 33a Drive connection claw 33b Drive connection claw 34 Pulley 34a Drive connection hole 35 Timing belt 36 Pulley 37 External gear 37a Drive connection hole 38 External gear 39 Drive Gear 40 External gear 41a Hasuba gear 41 Motor 42 Idler gear 42a Drive connection claw 42b Drive connection claw 43 Pulley 43a Drive connection hole 44 Timing belt 45 Pulley 46 Drive gear 47 External gear 48 External gear 48a Drive connection hole 49 Rotating shaft 49a Fixed Pin 52 Idler gear 52a Drive connection claw 52b Drive connection claw 53 Pulley 53a Drive connection hole 54 Timing belt 55 Pulley 56 Drive gear 57 External gear 58 External gear 58a Drive connection hole 59 Rotating shaft 59 Fixed pin 61 Motor 61a Hasuba gear 62 Idler gear 62a Drive connection claw 62b Drive connection claw 63 External gear 63a Drive connection hole 64 External gear 65 External gear 66 Drive gear 67 External gear 68 Pulley 68a Drive connection hole 69 Timing belt 70 Pulley 72 idler gear 72a drive connection claw 72b drive connection claw 73 external gear 73a drive connection hole 74 external gear 75 external gear 76 drive gear 77 external gear 78 external gear 78a drive connection hole 81 motor 81a motor gear 82 idler gear 82a internal tooth Hasuba gear portion 82b External toothed helical gear portion 83 Idler gear 83a Drive connection claw 83b Drive connection claw 84 External gear 84a Drive connection hole 85 Drive gear 86 Pulley 86a Drive connection hole 87 Timing belt 88 Pulley 89 External gear 93 idler gear 93a drive connection claw 93b drive connection claw 94 external gear 94a drive connection hole 95 drive gear 96 pulley 96a drive connection hole 97 timing belt 98 pulley 99 external gear 131 side plate 132 side plate 132a bearing 132b bearing 133 side plate 140 fixing device 141 Paper feeding cassette 142 Paper feeding roller 143 Registration roller pair 143a Registration roller 143b Registration roller 145 Fixing roller 145a Heat generation source 147 Pressure roller 150 Stack unit 160 Process unit 161 Photoconductor 162 Developing device 162a Developing roller 163 Charging device 164 Drum cleaning device 165 Optical writing unit 170 Re-feed path 171 Belt cleaning device 172 Cleaning backup roller 174 Primary transfer roller 17 The transfer unit 176 driving roller 177 tension roller 178 secondary transfer roller 179 intermediate transfer belt 181 discharge rollers 181a discharge roller 181b discharge roller 182 discharge sensor 183 duplex rollers

Japanese Patent No. 5387704

Claims (19)

A drive source capable of normal rotation and reverse rotation;
A rotatable input side rotating member to which a rotational driving force is input from the driving source;
A rotatable output-side rotating member that outputs a rotational driving force to the driven body;
Two systems of drive transmission paths for transmitting rotational driving force from the input side rotating member to the output side rotating member;
In the drive device comprising drive transmission path switching means for switching the drive transmission path from the input side rotation member to the output side rotation member,
The drive transmission path switching means moves between the two systems of drive transmission paths in different directions in the thrust direction during forward rotation and reverse rotation of the drive source. A drive device comprising: a rotatable moving rotary member that transmits a rotary drive force from the drive source to one drive transmission path or the other drive transmission path. The drive device according to claim 1,
The moving rotation member has a helical gear portion,
By rotating the drive source forward, the moving rotary member moves toward one end in the thrust direction, and engages with a first drive transmission member provided in the one drive transmission path to move from the movable rotary member. Drive is transmitted to the first drive transmission member,
By rotating the drive source in the reverse direction, the rotational drive transmission member moves toward the other end side in the thrust direction, and engages with the second drive transmission member provided in the other drive transmission path, thereby moving the rotational rotation member. The driving device is characterized in that the driving force is transmitted to the second driving force transmitting member. The drive device according to claim 1 or 2,
An internal gear that meshes with an output gear member provided on the output shaft of the drive source, and an external helical gear that is provided coaxially with the internal gear and rotates integrally with the internal gear. The drive device characterized in that the movable rotating member and the externally toothed helical gear mesh with each other. The drive device according to any one of claims 1 to 3,
In the two drive transmission paths, the rotation direction of the input-side rotation member and the output-side rotation member is reversed, and the rotation direction of the input-side rotation member and the output-side rotation member is reversed. A drive device characterized by being a drive transmission path. In the drive device according to any one of claims 1 to 4,
Of the two drive transmission paths, one is configured to perform drive transmission using a belt member that is rotatably stretched by a plurality of pulleys, and the other is a gear train in which a plurality of gear members are engaged. A drive device characterized in that drive transmission is performed at In the drive device according to any one of claims 1 to 4,
Of the two systems of drive transmission paths, one has an even number of drive transmission members and the other has an odd number of drive transmission members. In the drive device according to any one of claims 1 to 4,
One of the two systems of drive transmission paths is configured to perform drive transmission using an internal gear, and the other is configured to perform drive transmission using only an external gear. apparatus. The drive device according to any one of claims 1 to 7,
A drive device characterized in that the reduction ratios of the two systems of drive transmission paths are different. The drive device according to any one of claims 1 to 8,
The drive device characterized in that the rotational speed of the drive source is the same during forward rotation and reverse rotation. The drive device according to any one of claims 1 to 9,
Of the two drive transmission paths, the drive transmission path located on the drive source side in the thrust direction has a longer drive time or is used than the drive transmission path located on the opposite side of the drive source in the thrust direction. A drive device characterized by a high frequency. The drive device according to any one of claims 1 to 10,
A drive apparatus characterized in that the drive transmission path of the two systems having a smaller number of drive transmission members has a longer drive time or more frequent use than the other. The drive device according to claim 1,
A plurality of the two systems of drive transmission paths are provided corresponding to the plurality of the driven bodies, and each driven body is driven via the two systems of drive transmission paths by the rotational driving force from the drive source. A driving apparatus characterized in that a reduction ratio of at least two driven bodies among the plurality of driven bodies is different between forward rotation and reverse rotation of the drive source. The drive device according to claim 12, wherein
A drive device characterized in that the rotational speed is changed between forward rotation and reverse rotation of the drive source. The drive device according to claim 12 or 13,
The drive device characterized in that the difference in the reduction ratio is 3 [%] or less. An image forming means for forming an image;
In an image forming apparatus provided with a driving unit that drives a driven body by transmitting a rotational driving force,
An image forming apparatus using the driving device according to claim 1 as the driving unit. The image forming apparatus according to claim 15.
An image forming apparatus, wherein the driven member is a paper discharge roller for discharging a recording medium to a paper discharge unit. The image forming apparatus according to claim 15.
An image forming apparatus, wherein the driven body is a double-sided roller for reversing and conveying the recording medium in order to form an image on both sides of the recording medium. The image forming apparatus according to claim 15.
An image forming apparatus, wherein the plurality of driven bodies are a fixing roller and a registration roller. The image forming apparatus according to claim 15.
An image forming apparatus, wherein the plurality of driven bodies are a fixing roller and a paper discharge roller.

Images